Wow, my wifey got an XM Radio unit installed on my vehicle for my b-day and I love it. The "Boneyard" station is excellent, playing hard rock/metal songs that I never thought that I'd ever hear on the radio, stuff like Tyketto, Loudness, Bang Tango, plus the Liquid Metal channel kicks ass with it's Deicide and other death metal
The comedy channels are also pretty good, it's great because it's all uncensored and NO commercials, gotta love technology, he he he.
For those of you that live in the city, you probably already got some nice stations to listen to, but for me, I live in a smaller area that has lots of country stations, a classic rock station, 2 pop stations, and only one rock station that, but most of the time they either classic rock, Van Halen, or the same old songs over and over and over again. It's nice that I don't have to deal with those stations ever again, ha ha ha.